Effects of Oxygenated Fuels on Cold Start Characteristics of Diesel Engines Under Extreme Cold Conditions
In order to solve the problem of cold start struggling and failing of engine,comparative experiments were conducted on a diesel engine with integrated starting/generator technology fueled with-50# diesel A0(fuel oxygen content 0％),Al(fuel oxygen content 2.05％)and A2(fuel oxygen content 4.40％).Experimental data were collected on an en-gine cold start test cell of high plateau conditions at-43 ℃.Effects of different fuel oxygen contents on the processes and combustion of the diesel engine under cold start conditions were examined.The results show that comparing with A0,starting times of the diesel engine fueled with Al and A2 are shortened by 36.64％and 42.71％respectively.The amount of fuel consumption during cold start periods is reduced by 47.8％and 60.6％respectively and the speed fluctuation rate is re-duced by 25.3％and 43.8％respectively in the first 60 s of idle operation.With the increases of fuel oxygen content,the in-cylinder combustion temperature and in-cylinder pressure of the first diesel cycle,the heat release rate and the peak pressure rise rate all are increased.The CA 50 is advanced and the combustion duration is shortened.And the lower the number of cycles is during the starting speed rise,the higher the average maximum cylinder pressure,and the better the combustion stability during the starting process.
万方数据
维普
